AISI 1144 – Stressproof (A311-B)

STRESSPROOF® is made by a patented process which consists of drawing the bar through a special die under heavy draft, then stress relieving it in a precisely controlled furnace.

When Niagara LaSalle developed STRESSPROOF® in 1938, it changed the economics of part production.
For the first time, users could get an improved wearability without case hardening, strength without
heat treating, plus excellent machinability and tool life.

STRESSPROOF® is electro-magnetically tested using eddy currents. Other benefits include resistance to fatigue and stress, balanced working and minimum warpage and distortion.

STRESSPROOF® can also be induction hardened, but should be watched for quench cracks.

CHEMISTRY

Carbon (C)

0.40/0.48

Manganese (Mn)

1.35/1.65

Silicon (Si)

0.15/0.35

Sulphur (S)

0.24/0.33

Phosphorus (P)

0.040 Max.

* AISI 1144 heats to be used for STRESSPROOF® are nitrogen treated, and contain nitrogen in quantities normally associated with steel produced by the electric furnace process.

Process

Shape

Size

Cold drawn

Round

1/2" - 2"

Richmond Steel Canada LTD. is a first tier standard and metric steel service centre specializing in steel products such as cold finished bar, precision ground shaft, turned ground and polished shaft
including high strength distortion free shaft
in a large range of grades and shapes. Servicing
Ontario including Hamilton, Burlington, Oakville, Milton, Mississauga, Kitchener and Guelph.